Strathclyde Police said Annihilation was one of many psychoactive substances they been made aware of in recent months.

BBC: Annihilation legal high leaves nine in hospital

Three groups of psychoactive substances were classified at the end of 2009 and the committee is now looking at mephedrone, also known as Meow or Toot.

BBC: Profile: Professor Les Iversen, chief drugs adviser

As in Britain, the New Zealand government had attempted to control the influx of new psychoactive substances by imposing emergency restrictions under existing misuse of drugs legislation.

BBC: Kiwis on drugs: A blueprint for the future?

This week New Zealand publishes its Psychoactive Substances Bill, legislation which some believe will transform the international debate on drugs policy when it comes into force in August.

BBC: Kiwis on drugs: A blueprint for the future?

He presents data from pharmacological or epidemiological studies on what exactly those are, bolstering his argument with discussions on the nature of addiction and changing attitudes to psychoactive substances throughout history.

ECONOMIST: Plain speaking on a highly coloured issue

Novel psychoactive substances, mainly stimulants and cannabinoids from China sold on the internet, proliferate too quickly for anyone to keep track of them (though websites such as Erowid.org make an impressive attempt).

ECONOMIST: Drug use and abuse

"You would expect a spontaneous remission rate of 10% within in a year, " said Professor Paul Salkovskis, Maudsley Hospital Centre for Anxiety Disorders, who asks whether it is safe to give people with OCD psychoactive substances at all.

BBC: "Doc, I am ready to play ball."